The Non-Cooperation Movement saw some success. But ultimately, it had to be withdrawn because of several reasons:--

1).  People who had left their jobs, colleges to support this movement had to come back because they had to support their families and themselves. So they came back to their jobs. People found the use of khadi to be expensive and so started buying British factory made textiles again. 
2).  There was widespread violence too. Due to the incident known as Chaura-Chauri, Gandhiji was compelled to stop this movement.